Refactor package build workflow

* Merge llvmdev_win_builder.yml + llvmdev_win-64_conda_builder.yml into one
  to avoid code duplication
* Add input parameter to be able to select between recipes to build
* Rename flow to llvmdev_builder.yml as it contains nothing specific to
  windows and the code is just a generic conda package builder
* Add ${{ matrix.recipe }}-${{ runner.os }} to upload name to better
  differentiate artifacts
* Remove "x" from `bash -elx {0}` as that pollutes the Action log due to
  the implicit `source "$CONDA/etc/profile.d/conda.sh` calls in every
  step.
* Set `run-post: false` to avoid setup-miniconda cleaning up the Github
  Action VM as that is wiped after the run anyways
* Run the flow if it gets changed in PRs, to see a public verfication
  that the changes are actually working

.github/workflows/llvmdev_builder.yml

@@ -0,0 +1,74 @@
+name: llvmdev_builder
+
+on:
+  pull_request:
+    paths:
+      - .github/workflows/llvmdev_builder.yml
+  workflow_dispatch:
+    inputs:
+      recipe:
+        description: "Recipe to build"
+        default: "llvmdev"
+        required: true
+        type: choice
+        options:
+          - "llvmdev"
+          - "llvmdev_manylinux"
+
+concurrency:
+  # Concurrency group that uses the workflow name and PR number if available
+  # or commit SHA as a fallback. If a new build is triggered under that
+  # concurrency group while a previous build is running it will be canceled.
+  # Repeated pushes to a PR will cancel all previous builds, while multiple
+  # merges to master will not cancel.
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
+  cancel-in-progress: true
+
+jobs:
+
+  windows:
+    runs-on: windows-2019
+    defaults:
+      run:
+        shell: bash -el {0}
+    strategy:
+      matrix:
+        recipe: ${{ github.event_name == 'workflow_dispatch' && [github.event.inputs.recipe] || ['llvmdev', 'llvmdev_manylinux'] }}
+
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v4
+
+      - name: Setup Miniconda
+        uses: conda-incubator/setup-miniconda@v3
+        with:
+          auto-update-conda: true
+          auto-activate-base: true
+          activate-environment: ""
+
+      - name: Install conda-build
+        run: |
+          conda install conda-build
+
+      - name: Build conda package
+        env:
+          CONDA_CHANNEL_DIR: conda_channel_dir
+        run: |
+          mkdir $CONDA_CHANNEL_DIR
+          conda build ./conda-recipes/${{ matrix.recipe }} --output-folder=$CONDA_CHANNEL_DIR
+          ls -lah $CONDA_CHANNEL_DIR
+
+      - name: Upload conda package
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ matrix.recipe }}-${{ runner.os }}
+          path: conda_channel_dir
+          compression-level: 0
+          retention-days: 7
+          if-no-files-found: error
+          run-post: false
+
+      - name: Get Workflow Run ID
+        run: |
+          echo "Current workflow run ID: ${{ github.run_id }}"
+          echo "Use this ID when triggering llvmlite workflow"